Improvement in machines for molding spool-heads from paper-pulp



UNITED STATES 4Prvrrnvfr OFFICE,

J EHIEL O. OOBURN, OF WORCESTER, MASSACHUSETTS, ASSIGNOR TO LEMUELOOBURN AND JOHN K. JAMES, OF SAME PLACE.

IMPROVEMENT IN MACHINES FOR MOLDING SPOOL-HEDS FROM PAPER-PULP.

Specification forming part of Letters Patent No. 151,757, dated June 9,1874; application filed December 10, 1873.

- GASE- A.

ings, which form a part of this speciication,

and in which- Figure l represents a front view of such parts of myimproved spool-head mechanism as are necessary to illustrate myinvention.

Fig. 2 represents a horizontal section of the forming-cylinders, andFig. 3 represents a central vertical section of the same.

The nature of my invention consists in improved mechanism for formingspool-heads directly from pulp, as hereinafter described.

In my improved mechanism I employ an outer cylinder, marked A in thedrawings, formed of perforated sheet metal, supported and braced on theexterior by vertical wire bars a, extending from end to end of thecylinder, and having their extremities fixed in the upper annular rim Band lower rim O, which rims embrace the upper and lower ends of thecylinder, while a helical winding, or

' hoops, of wire, b, envelops the bars a between the rims B C, asillustrated. The cylinder A is supported upon a suitable bed-plate, I),

having a circular disk raised at its center, which disk fits into thelower end of the cylinder, and retains it in position on the bed. Hthinthe cylinder A, concentric therewith and projeciing up from the centerof disk on the bed D, I arrange a second smaller cylinder, E, which Ialso make of perforated metal, and of a diameter equal to the-requireddiameter for the eye of the lspool-head or opening, into which thespindle or barrel of the spool lits. The outer cylinder A equals theouter diameter of the spool-head. I arrange a bottom plate, F, in theannular space between the two cylinders A E, which plate F is ofperforated il ar plate, G, is also arranged between the face of thepressure-plunger H and the spool-head material. The plunger II is formedhollow to receive the cylinderE within it as it descends into thecylinder A when the mechanism is in operation. The cylinders arearranged in a suitable frame, and the plunger H is to be combined with ascrew, lever, or other devicc for imparting pressure thereto, whichdevice may be of any suitable well-known construction, and is not,therefore, shown herein.

The operation is as follows: The pulp from which the spool-heads are tobe formed is placed within the annular space between the outer and innercylinders. Pressure is then applied to the plunger H, which is forceddown upon the mass to condense it to the proper thickness, the moisturefrom the pulp passing out through perforations of the inner and outercylinders and plates F G. When the water has been expelled from the pulpand the material properly condensed, the plunger His raised and thespool-head removed by raising the outer cylinder A from the bed D, andthen slipping the spool-head off from the inner cylinder E.

The spool-heads may be further condensed in a suitable swaging-die, togive the required uniformity of size and smoothness of surface, or theymay be subjected to other modes of finish.

By the use of the central perforated cylinder the substance of the headsis caused to condense uniformly around the eye, so that the heads arenot liable to be soft and weak at their junction with the barrel of thespool.

Having described my improved mechanism for forming spool-heads, what Iclaim therein as new and of my invention, and desire to secure byLetters Patent, is-

The within-described mechanism for forming spool-heads from pulp,consisting of the concentric perforated cylinders -A E, annular plates FG, and pressure-plunger II, all constructed and arranged for operationsubstantially as set forth.

JEHIEL C. COBURN.

Witnesses z Untis. H. BURLEIGH, B. JAivnis.

